Rabble



E. c. ROBINSON.

RABBLE.

APPLICATION FILED JAN. I7. I9I9.

Patented Sept. 21, 1920.

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and an inner member through `which latter Y roasted upon the hearths ofthe furnace, it

' of the outer'member. of the rabble arrn/ inl a bossvlocated at and surrounding the'opening in the outer shaft of the rabble.- This rT UNITED STATES P AT1-:NT oFF-ICEX.: I

` EUGENE CLAYBORNE ROBINSON, OF DOUGLAS, ARZNA, SSIGNOR OF FIFTY-FIVE ONE-HUNDREDTHS TO PHEL-PS DODGE CORPORATION, `A CORPORATION-OF NEW ironia.A

new and useful Improvements in Rabbles, 5 4of which the following is a specification,

This invention relates 'to .improvements in rabbles forL metallurgical roasting ovens ofthe type .in which the cooled by air; f 1 Y v As is well known, rabbles in this typeof lfurnace ordinarily embody an. inner hollow shaft and an outer inclosing shaft, the arm of the rabble comprising an outer 'member airis supplied and passes into the outer member of the arm and is thenceconducted to theouter shaft Vof the rabble through `which it passes to the air outlets. In one type of rabble the inner end of-the inner an opening in the outer. or exhaust-fluid,

conducting shaftof the rabble, the said members of the arm opening directly into the interiors ofthe respective shafts. the purpose of securely supporting the outer member of the arm to enable it to withstand the stresses to which the arm lis subjected as vit 'operates againstl ore to be has been Vcustomary to seat the 'inner endarrangement, however, presents disadvantages for if the boss is made' suiciently long to provide a firm and secure seat for ythe inner en d of the outer memberfof the rabble arm, it is insufficiently ,cooledin the opera`` p l y the opening 7 and it is preferable that the boss Ais formed y"relatively short' the. saidI 2 outer member of the rabble arm will nothavevsuflicient purchase in thesoclret` pro-l tion of the roaster, and as a consequence soon becomes burned away. lf,'on the other'.Y

hand, in order tojprevent burningaway, the

vided'by the boss to withstand'the stresses provide Ameans for so seating the rabble Specification of Letters Patent.

length only needv be shaft of the rabble.

rabble arms are s the inner or cooling-fluid supply shaft of For ` RABBLE.

` arm the rabble shaft that a'mbearing of maximum length'will be al'ordedfthe arm and at, the sametimea boss of minimumv provided upon theI outer y The ligure yof the accompanying drawing 1s a viewfpartly in vertical section. and

Patented sept. 21, 192,0. Application flied January 17, 1319'. serial No. 271,746,Y I s E fpartlyr'in elevation of a portion of a roaster, Y

rabble embodying the present invention. "f In. the drawing the numeral lindicates the rabble and the numeral 2 indicates the outer -or exhaustfluid'-conducting shaft of` the rabble, these shafts being concentrijcally v positioned with'relation to eachother, and

the shaft l being connected with anysuitable source of air supplysuch, for example, Y as a blast fan, and the shaft 2 being in com- '.l

munication with the, usualV outlets forthev i air after it has performedits function of cooling'the rabble arms. For a purpose'to be "presently explained, thesha'ft lis formed iat intervals with openings 3 through. which f the cooling air is to be discharged intothe rabble arms, and surrounding each opening ythe shaft is formed exteriorl'y'with a flangeV ,4t which forms a seat, indicated bythe nuV- meral 5,.the flange being concentricto the greater diameter than the said opening so that a seating shoulder 6 is provided va'tthe inner end ofthe said seat. Opposite each suficiently short yto guard againstundue heating of its outer portion, which, is ythe disadvantage heretofore pointed out for the f, ordinary forms of rabbles in which this'boss hasjbeen formed ofl considerable length inv order toA provide a suiiciently long bearing for'the inner -end of the rabble arm. In-

teriorly the boss isof the same diameter as boss Vbeinteriorly flared at its outer end blerarmwhen fittingthe arm into place. Also, for apurposeto be presently pointed I asy indicated by the numeral v9, soas to permit of the more ready insertion of the rab-v out, each boss' 8 is formed-in its .upperside s 85 opening 3 in the shaft ..1the shaft 2 v formed withl an'opening 7 and exteriorly with ani integral collaror boss-8 which is outer'tubul'armember 12 andan inner tubu lar member 13, the outermember 12 being Y closed at its outer end by a plug 14 having the lusual apertured lug 15 to receive the usual pin (not shown) which is to hold in place upon the arm the rakes of the rabble. It 1s preferable that thev plug 14 be formed eonlcave in its inner side as indicated bythe :the inner `end of the vinner tube Vis connected or unitedto (the inner end of the outer tube orlmeniber 'and lthe said inner tubeiormember is 'supported entirely bythesaid outer nremben whereas 'in lthe ordinary 'construction, asV before stated, fthe inner endof 'the innerftub'e orimemberlis secured intheopening in the'inner sha'lftofithe rabble andilike- Iwiseftheinner end of' thleouter` tube or mem- 'ber sjsecured in. the'op'enmgor Yboss 'provided''f'orfits reception upon'the outer-"shaft ofthe rabble. Thus-inthe present construe tionlthe's'aid'inner end oftheV innertube or member 13 yis secured, as indicated by fthe "numeral 17,"withi`n'v thel opening of 7a bushingV "l-whieh bushing infturn is itted'and'sef Vcured .withinlthe inner Lend offthe 'outer tube '1 o'r 'memberi12, these parts being'permanently Vand"rigidly united so as `to eonstitute'prae- Y tically an integral structure. Thearrangey fment issuch :tha-tithe inner ends of thememl'bers 12 and Yl-fand the'exp'osed face ofthe bushin'gallI touch or'occupy a common Vplane forfi'niother `wordsyare flush Vwith respect to one another.

in 'assembling fthe-rabble am with Y the rabble-'shaft as a\vhole`,"the inner endofthe Aarm Visiitted through'fthe boss 8 andop'eninfgfT and intothe'seat 5 and" snugly fitting "within `the "opening"and seat, v as clearly jshown Vfin the "drawing and resting against "'theseating shoulder 6,A lnteriorly the-inner `gmeinber tortube lfoffthe'am yis of sublstantially f the 'saineu diameter' jasthey opening "so-thatf'there Willbe an"unobstructed pas- `sage "of-the airI or other cooling fluid #from theshaftli'nto the said member orf tubefl. The Cooling 'fluid after p assing jthrough the "member 13, issues fromfthe outer end 'of the said member, which `end is locatedrela-l tively e'loseV toA theL lconcave inner side ofthe plug 14 andv is "defleoted's'o' asl to Aflow in aninward directionthrough the outerftube 'or member 12Jjfnally issuing'through openings '19 formed' in: the-said member'atL the inner end thereof, these openings A19 .being sololcated las to communicatewith 'the gspace lbe- Y ftween thev inner and outer shafts 1 fand' 2. conduetingfshaft and 'intolthef'seatan'dan 130 After issuing from the openings 19iinto the space between the shafts 1 and 2, the cooling Viluid will of course pass to other arms and will finally exhaust through the usual lvantage gained by 1 the -construction forming the subj eet lmatter f of -the present invention is that *the inner i end of "the varm as vwhole is given Aa bearing-of maximum ilen'gth in lthe`^rabble shaft, althought'heboss 8 maybe Vin itself very short. As a result'the rabble arm is enabled to better resist" the stresses? to r`whih i-tlis subjeeted in-oper-ating uponthe ore distributed uponthe hearthsl ofthe "furnace and ,there V`-i's 'little or no Jlikelihood 'of -quickly fitted into place and thus the ne- 'ee'ssity` o'f ir'stf securing the innerL Vendfof l the inner tube-{orrmember "181m 4place in the usual openingfinithe inner shaft 1 V`andJ 'subsequently independently fittin'gfor securing Y the' innerendr ofi the outertube or= member12 1-viated and 4this of Y course '1 means fa fconsiderl'ablesai'fing initime 4and flabor aside from l lobviating the other l disadvantages Lheretoforepointedout attending the useofthe oldy Y fsuppoited fwithi-n- `=and bylthe outer member 1 f and the 'inner 'en'd of fthe outer *member 'of f tlie-arm being 'Jttedthrou'gh the said open- "ling in?the-seeondLmentionedshaft endif-into the? sa-idseat. i Y 12. V-In Aapparatusof cooling-fluid 'supply yshaft provided''eXtethe 'classL-deseribed, a Y

*outer* #tubular memberfiitted atfits inner 'fend Y, l

through vthe opening @in ythe'fexhaustfinid inner tubular member in communication' With the cooling-fluid supply shaft and With the interior of the outer member. l Y i 3. In apparatus of the class described, a

cooling-fluid supply shaft, an inclosing fluid conducting shaft, the first mentioned shaft v having a seat and an opening surrounded thereby in communication With its interlor and the second mentioned shafthaving an opening opposite the seat, and a rabble arm comprising inner and outer tubular members substantially integrally connectedv at their inner ends, the arm being fitted at its inner end through the opening in the see-v ond-mentioned shaft and into the seat and the said inner tubular member communicating With theV interior of the cooling-fluid supply shaft.

4. In apparatus of the class described, a cooling-fluid supply shaft, an inclosing eX- lhaust-fluid Conducting shaft, the shafts having alined openings and the first mentioned shaft having a seat surrounding its respective opening and disconnected from the eX- inner cooling-fluid supply shaft, an in clos-l ing exhaust-fluid conducting shaft, the supply shaft having an opening and being provided eXteriorly surrounding its opening with a seat, the exhaust-fluid conducting Vshaft having an opening opposite the opening in the first mentioned shaft, and a rabble arm including an outer tubular member, an

inner tubular member, and a bushing se- A cured Within the inner end of the outer'V member and Withinl the opening of vWhich the inner lend of theinnerpmember is se# cured, whereby to conneotthe said members and afford a support for' the inner member,

the outer member having an outlet opening and the outer end of the innermember comf municating With the .interior of the outer..

member, the saidouter member of the arm being fitted at its inner end through the shaft yand intiovthe seat upon`thecooling-- fluid-supply shaft With itssaid opening oom-l municating Vwith thev space between the shafts, the inner end of theinner member communicating. with the interior of the cool- ,ing-fluidi supply` shaft through the said opening therein. v y

6. A rabble arm comprisingv an outer tubular member andan inner tubular member located Within and spaced from the Wall of the outer tubular member, and means'at the inner end of the arm connecting the said members and vconstitutingthe sole support, for the inner member.

7. In apparatus of the elassdescribed, an inner cooling-fluid supply shaft, an inelosing exhaust-fluid conducting shaft, the shafts having oppositely located openings and the first mentioned shaft being provided.

exteriorly with a seat surrounding its opening and free from connection With the sec-l" ond mentionedshaft, and a rabble arrrrcom` prising inner kand outer tubular members, the outer member being connected with the inner member at the inner end of the'y arm and bodily supported thereby, the said outer member ofthe arm beingfitted through the opening in the second mentioned shaft vand vseating at itsinner end'in the seat in the first mentioned shaft in position with the inner end of the inner tubular member of the arm communicating with lthe opening inthe first mentioned shaft. V'

In testimony whereof I afliX my signature. i p

EUGENE GLA'YYBORNE RoB1Ns0N. [f.. s.; n

55?v opening in the exhaust-fluid conducting l 

